Depending on what you need done, I highly recommend Pete Pieper of Precision Barrel Work in Hempstead, TX. http://www.precisionbarrelwork.com/
Pete is a good friend of mine, a great gunsmith/machinist, very honest, and an all-around great guy. He does gunsmith work on rifles, not pistols, so he wouldn't be the right person to contact about your Glock. He does barrel chamering, profiling, crowning, and installation, fluting, action work, bedding, etc., and he builds complete rifles.
He sends out his Cerakote work, though.
If you just need Cerakote only, I recommend Karl Kampfeld.http://www.kampfeldcustom.com/